On the "Skins" tab of the new launcher, the skin of the left leg of the player model is rendered backwards. The arms and legs should be mirror images of each other, and the arms are correct in this respect. The left leg, however, renders backwards and does not mirror the right leg. See images linked below:

proper rendering in-game: https://i.gyazo.com/f435209e90b933ecb38069d87feded20.png

incorrect rendering in the new launcher: https://i.gyazo.com/fabfe9ed6fa5952b19e4d42102887610.png